快速密闭催化消解测定水中COD的方法改进

标准法测定水中化学需氧量虽然方法相对成熟,但是在分析大量水样时效率低,而且催化剂Ag2SO4的价格昂贵。通过改进快速密闭催化法并以MnSO4代替Ag2SO4为催化剂,用量为5.0 g/L;消解时间为30min,测定了标准溶液和五种不同来源污水中的COD值,结果表明:本法与标准法测定值无显著性差异,精密度和准确度均能满足测定要求。

Improvement of Determinating COD in Water by Fast Airtight Catalytic Method

Standard method of determinating chemical oxygen needed in water is relatively mature,but when analyzing large amount of water samples,we found that efficiency was low and the catalyst silver sulfate was expensive.By improving fast airtight catalytic process and replacing silver sulfate with manganous sulfate as the catalyst,the precision and accuracy both met the determinate request as it was compared with the sandard method.So this method was proved to be viable.